Process for producing the calcium salt of acetyl salicylic acid.



U IT D sTAtrEs PATENT OFFICE.

RiUDOLF BERENDES, OF ELBEBFELD, GERMANY, ASSIGNOR TO FABIBENFABBIKEN VORM. FRIEDR. BAYER & 00., OF ELBERFELD, GERMANY, A CORPORATION OF GER- MANY.

I PROCESS FOR PRODUCTNG THE'CALCIUM SALT OF ACETYL SALICYLIC ACID.

1,020,182. No Drawing.

Specification 0! Letters Patent.

Application filed September 13, 1911. Serial No. 649,145.

Patented Mar. 12, 1912.

To all whom it may concem: Y

' Be it known that I, RUDoLr BERENDES, doctor of philosophy, chemist, citizen of the German Empire, residing at Elberfeld, Germany, have invented new and useful Im- This process consists in treating acetyl .salicylic acid with an alcoholate of calcium.

In order to illustrate the new process more fully the following example is given, the parts bein vby weight :-20 parts of calcium are heate with 2000 parts of ethylalcohol and the resulting solution is addedto a solution of 180 parts of acetyl salicylic acid in 1500 parts of ethylalcohol. The calcium compound is filtered oil and dried. It crystallizesfrom alcohol in the shape of colorless almost tasteless needles which are easily soluble in water furnishing a neutral solution. A' yellowish-gray precipitate is obtained with ferric chlorid. It is a valuable soluble substitute for acetyl salicylic acid.

I claim J i v The herein described process for producing the calcium salt of acetyl salicylic acid, V

which process consists in treatin acetyl sali-' cylic acid with a calcium alco olate, substantially as described.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

'RUDOLl BEnEnnES. a 5.1} Witnesses: 1 I

L. Norm,

A. Numn; 

